Datacolor 45IR User Guide, 5.2014, Version 1.0 (4230-0402M)
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First select via “soft key”
reference
and make a measurement on a patch which will be the future reference
patch.
Now activate via “soft key” Sample
and make a measurement on a sample patch. A triangle symbol in front
of the measurement value indicates that delta values (difference between reference and sample) are
shown. Future sample measurements will be compared to the once measured reference values as well.
Now activate the
Delta Mode
by selecting the triangle symbol.
The function
Densities CMYK
is especially suitable for the measurement of multicolored composed CMYK
colors, e. g. in logos, to find out the reason for possible color shifts.
Density Graph
The function
Density Graph
enables the exact display of density values for any spot color. Usually the
standards define density filter characteristics only for the process colors Cyan, Magenta, Yellow and Black.
The Datacolor 45IR can obtain a virtual spectral density characteristic for any spot color. The great advantage
is that the process control of spot colors can now be as easily achieved as the four process colors.
In the following example a measurement has been made on a blue
spot color.
The density graph is derived from the remission spectrum and
represents the density spectrum for wavelengths from 400 to 700
nm. The peak of the curve displays where the spectral density value is
taken.
In this case the spectral density for the blue color is D = 1.57 at a peak wavelength of
580 nm.
Only spectral densities relating to the same peak wavelength (Dmax)
can be compared.
Datacolor 45IR displays the spectral density automatically as
well in
the Densities CMYK measurement mode.
The density values for CMYK show to what extent the spot color can as
well be registered by the CMYK color related standard density filters.
Here in this case, the blue color is close to a Cyan; therefore the density value in the Cyan channel is quite
large
